soldering and brazing
TRANSCRIPT
Presentation Topic:
Soldering and Brazing
Group Members:Abdullah 15053386-005 Muhammad Atif 15053386-015Muhammad Alyas 15053386-020Aakash Zafar 15053386-035M. Mubashar 15053386-036
Group No: #06
University of Gujrat:
Introduction:
Soldering and brazing
provide permanent joint
to bond metal pieces.
Soldering and brazing
process lie some where in
between fusion welding
and solid state welding.
Brazing
Soldering:
Definition:-
• The joining of metals using a filler material of a lower
melting point than that of the parent metals to be
joined.
Soldering Process:
5
1
1. Heat both items by applying the
soldering iron to the copper pad and the
component lead.
2
2. Continue heating and apply a few
millimeters of solder. Remove the iron and
allow the solder joint to cool naturally.
3
3. It only takes a second or two to make the
perfect joint, which should appear shiny.
A Good Solder Joint:
6
• Smooth • Shiny
• Clean
• Concave fillet
Bad Solder Connections:
7
Cold Solder Joint Not Soldered
Soldering Tools:
8
1. Vise
2. Safety Glasses
3. Solder Sucker
4. Solder Tool
5. Diagonal Cutters
6. Nose Pliers
7. Solder
8. Solder Wick
9. Damp Sponge
10. Soldering Iron
12
3 4
5
6
7
9
8
10
Solder:• Solder is an alloy of Tin and Lead.
• The solder used for electronics is frequently called
60/40 solder because it is made of 63% tin and 37%
lead.
• 60/40 solder melts at 361 F.
• Multi-core solder is the usual form for electrical
work.
9
Soldering Iron:
10
Typically 25-30 watts
Tip Temperature 750°F (400 °C)
Tinning Process:
11
1.Apply Solder to Iron Tip 2.Roll Tip on Damp Sponge
3.Properly Tinned Soldering Iron Tip
Soldering Iron Care & Maintenance:
• A soldering iron must be coated with a
thin coat of solder. This will allow for
the transfer of heat to the work piece.
• This procedure is called tinning.
• The tip must be kept coated with a
shiny layer of solder by occasional
wiping and applying solder directly to
the tip.12
Tinned
Un-Tinned
What is Flux?
Flux is a chemical compound.
Is applied and shields the joint surface from air
and prevents oxide formation.
Although flux will dissolve and
absorb oxides.
Applications:• Soldering is use in
electronics and in
jewelry metalwork.
• Some refrigeration
components are often
assumbled and repaired
by the higher
temperature silver
soldering process.
Applications:
• It can also be used as a
semi-permanent patch
for a leak in a container
or cooking vessel.
• Electronic soldering
connects electrical
wiring and electronic
components to printed
circuit boards (PCBs)
Advantages of Soldering:1. Low power is required.
2. Low process temperature.
3. Microstructure is not affected by heat.
4. Easily automated process.
5. Dissimilar materials may be joined.
6. High variety of materials may be joined.
7. Thin wall parts may be joined.
Disadvantages of soldering:
1. Large sections cannot be joined.
2. Fluxes may contain toxic components.
3. Soldering joints can not be used in high temperature applications.
4. Low strength of joints.
5. Careful removal of the flux residuals is required in order to prevent corrosion.
Barazing:
• Brazing is when a filler
metal or alloy is heated
to its melting
temperature above 450
°C.
• In this case only filler
metal melts, there is no
melting of workpiece
metal.
Brazing Process:
1. In a brazing operation, you apply heat broadly to the base metals.
2. The filler metal is drawn through the joint to create this bond is capillary action.
Brazing Methods:• Torch Brazing:-
flux is applied
to the part surfaces
and a torch is used to
focus flame against
the work at the joint. A
reducing flame is used
to prevent the
oxidation.
• .
• Furnace Brazing :
Furnace Brazing used to heat the workpieces to be joined by
brazing operation. The component parts and brazing metal
are loaded into a furnace, heated to brazing temperature, and
then cooled and removed.
Induction Brazing:- A process that uses electrical
resistance of workpiece and high frequency current
induced into the same as a source of heat generation.
The parts are pre-loaded with filler metal and placed in
a high frequency AC field.
Power supply
Dip Brazing:
Assembled parts are typically dipped in a
heated chemical bath which serve as both fluxing agent and
heat source to melt pre-applied filler material.
Brazing Welds:
Advantages of Brazing:1. Any metals can be joined including dissimilar
metals.
2. Certain brazing methods can be performed quickly.
3. Brazing can be applied to join thin-walled parts that can’t be welded.
4. In general, less heat and power are required than in fusion welding.
Disadvantages of Brazing: 1. Joint strenght is generally less than that of a welded
joint.
2. Although strenght of a good brazed joint is greater than that of the filler metal it is likely to be less than that of the base metals.
3. High service temperatures may weaken a brazed joint
4. The colour of the metal in brazed joint may not match the colour of the base metal parts
Thank You!